export function setCookie(key, value, seconds, path = '/') { 
    var date = new Date() 
    date.setTime(date.getTime() - 8*3600*1000 + seconds * 1000) 
    document.cookie = key + '='+value+';expires='+date+';path=' + path 
}
export function getCookie(key) { 
    var cookies = document.cookie // 所有cookie == 'key=value; key=value; key=value' 
    if(!cookies) return 
    var arr = cookies.split('; ') 
    for(var a = 0; a < arr.length; a++) { 
        var brr = arr[a].split('=') 
        if(brr[0] === key) { 
            return brr[1] 
        } 
    } 
}
export function removeCookie(key, path = '/') { 
    setCookie(key, null, -1, path) 
}